Office Desktop IKEA ARKELSTORP https://www.ikea.com/ru/ru/catalog/products/40384973/  Who works in the V-Ray version is lower than 3.1. Be careful in the materials in the BRDF section there is a Microfaset GTR (GGX) if your version is older than 3.1 the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable to you. For Corona render it is recommended to install a version not lower than 1.5 since the glossiness of materials is customized taking into account PBR Enjoy using =)